After I have managed to "siam" the temptation of the Sony FF camera, I finally gave in and bought an A7 today.
I don't know whether this is a new info or you guys have known this before:
The Metabones Speedbooster EF to NEX works on the A7. The funny thing is that on Nex 7, the AF works only with Canon L lenses. So, for non-L Canon lenses & 3rd party lenses (such as Sigma 35 f1.4 and my other Contax N lenses) must use manual focus. But on a A7 body, all those lenses came alive and the AF starts working (even though it is slow). It gets me real excited that till this moment, I still cannot sleep.... LOL.
The only set back is the A7 camera will be switched to the APS-C size capture mode automatically. But that doesn't concern me at all. At least, I can use all my EF mount lenses on the A7 now, even though the file size is limited to only about 10mp.